* {
    padding: 0;
    margin: 0;
}

html,
body {
    height: 100%;
}

div.test {
    width: 1rem;
    height: 1rem;
    background-color: red;
}

body {
    // height: 100%;
    display: flex;
    flex-direction: column;
    background: #000d4a url(../imgs/bg.jpg) center top;
}

header {
    width: 100%;
    height: 1.05rem
        /* 105/100 */
    ;
    background: url(../imgs/bg.jpg) no-repeat center center;
    text-align: center;
    position: relative;
    color: #fff;
    font-size: .30rem;


    span {
        position: absolute;
        right: .2rem;
        top: .2rem;
    }
}

.main {
    display: flex;
    justify-content: space-between;
    flex: 1;
    margin: .2rem;
    background-color: red;

    .column {
        width: 30%;
        height: 100%;
        background-color: green;

        &:nth-of-type(2) {
            width: 45%;
            height: 100%;
            margin: 0 .2rem;
            // background-color: black;
        }

        .box {
            width: 100%;
            background-color: rgba(0, 0, 0, .2);
            margin-bottom: .15rem
                /* 15/100 */
            ;
        }
    }
}